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A car travels in a flat circle of radius R. At a certain instant the velocity...

A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 20 m/s north, and the total acceleration of the car is 2.5 m/s2 37o south of west. Which of the following is correct?

R= 0.16 km, and the car's speed is decreasing.
R = 0.20 km, and the car's speed is decreasing.
R = 0.16 km, and the car's speed is increasing.
R = 0.20 km, and the car's speed is increasing.
R = 0.40 km, and the car's speed is decreasing.
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